Join LangChain as a Senior Backend Engineer to build backend systems for AI observability and evaluation at scale.
Posted by employer 1 day ago
First seen on Joblaze 11 hours ago
Last verified on the company career page 11 hours ago
Skills & Technologies
What you'll build
- Design backend services and APIs
- Collaborate on architectural decisions
- Optimize storage and query performance
- Ensure system reliability
- Create and maintain technical documentation
Must have
- 5+ years of professional experience in backend engineering
- Proficiency in Python or Go
- Strong understanding of API design
- Experience with high-throughput systems
- Experience with database systems
Nice to have
- Familiarity with fullstack or frontend engineering
- Performance tuning experience
- Debugging production issues
Requirements
- Experience
- 5+ years
Not disclosed in this posting: work arrangement, visa sponsorship.
Benefits
Joblaze summary
In this role, the Senior Backend Software Engineer focuses on developing and maintaining backend systems that support LangChain's observability and evaluation platform for AI applications. Key skills include proficiency in backend languages like Python or Go, as well as experience with high-throughput systems and database management. This position is suited for seasoned engineers with a strong background in backend development and a collaborative mindset, particularly those who can navigate complex production environments. The LangSmith team is integral to defining AI observability standards at scale.
Joblaze insights
- Listed today — first seen on Joblaze October 9, 2026. Last confirmed on LangChain's careers page October 9, 2026.
- Salary band is in line with the typical range for Backend roles (median ~$180,000).
- Starts above 52% of 148 comparable senior backend roles in United States that list Python we track (median $174,958 across 62 companies). See Python salary trends
- Python appears in 40.2% of 503 comparable senior backend roles in United States; ClickHouse appears in 3% of 503 comparable senior backend roles in United States.
Quick facts
- What's the salary range?
- LangChain lists $180,000–$240,000 for this role.
- How much experience is required?
- At least 5 years of relevant experience for this Senior Backend Software Engineer, AI Observability & Evals Platform (NYC) role.
- What's the tech stack?
- Joblaze extracted these technologies from the posting: AWS, Azure, ClickHouse, GCP, Go, PostgreSQL.
- What seniority level is this role?
- LangChain targets senior candidates for this position.
- Is this full-time or contract?
- Full-time for this Senior Backend Software Engineer, AI Observability & Evals Platform (NYC) role at LangChain.
From the original posting
About Us
About The Team
The LangSmith team owns and builds LangChain's core platform for observability, evaluation, and production reliability of AI systems. From tracing and annotation to run rules, evaluations, and beyond, this team owns LangSmith end-to-end. If you want to define what great AI observability looks like at production scale, this is where that work gets done.
About The Role
We are looking for a Senior Backend Engineer to join us. In this role you will be building the backend systems that power LangChain’s observability and evals platform. You will work on the core services that allow developers to monitor and evaluate their AI applications at scale. While the focus is on backend feature development, familiarity with fullstack or frontend engineering, performance tuning, and debugging production issues would be extremely valuable.
What You'll Do
Design, develop, and maintain backend services and APIs to support LangSmith’s tracing, monitoring, and evaluation workflows.
Collaborate on architectural decisions to ensure systems are performant and maintainable.
Optimize storage and query performance for high-volume observability and evaluation data.
Ensure system reliability through strong testing, monitoring, and alerting practices.
Troubleshoot and resolve production issues, performing root-cause analysis and implementing long-term fixes.
Create and maintain technical documentation, including system design and API references.
Work closely with full-stack engineers, product managers, and product designers on rolling out new features.
What You'll Bring
5+ years of professional experience in backend engineering working on highly complex products
Proficiency in one or more backend languages/frameworks, ideally Python or Go
Strong understanding of API design and building reliable data services.
Experience with high-throughput or mission-critical systems.
Demonstrated ability to optimize backend services for performance and reliability.
Experience with database systems (Postgres, Redis, Clickhouse), and cloud platforms (AWS, GCP, Azure)
Strong communication skills, with the ability to collaborate cross-functionally
Customer centricity and ownership mentality
Compensation
Annual salary range: $180,000- $240,000
Standard company text repeated across LangChain's postings is omitted here.